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Interfacing Embedded System with Computer Software Using VB.net

Interfacing Embedded System with Computer Software Using VB.net. Presented by :- Sulaiman Salim AL Habsi. Why VB.NET ????????. New implementation of classic VB on .NET framework . Object Oriented Programming Language . Very close to human language . Not case sensitive .

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Interfacing Embedded System with Computer Software Using VB.net

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  1. Interfacing Embedded System with Computer Software Using VB.net Presented by :- SulaimanSalim AL Habsi

  2. Why VB.NET ???????? • New implementation of classic VB on .NET framework . • Object Oriented Programming Language . • Very close to human language . • Not case sensitive . • Easier Graphical User Interface (GUI).

  3. Data types and Declaration • int Integer • string  String • double  Double • char  Char • bool  Boolean • Dim [variable name] As [data type]. • Do not use semicolon !!!!! .

  4. Function and Loops • While loop • Do While (condition) • - statement • Loop • Do Until (condition) • -statement • loop

  5. Functions and loops • For loop • For [variable name]=initTo [max] • -statement • Next • For each (google)

  6. Function • Public Sub functionName(ByRef f As Integer) • End Sub

  7. Function • Public Function R_function(ByValh As String) As String • Return "String" • End Function

  8. DLL • Use ready code • Intermediate language for all .NET frame work • Add to the project • Import to the class

  9. URL request • URL request are used request a html document from a web server . • If you are behind a web proxy you’ll need to but proxy setting .

  10. How to make a URL requist • Imports System.Net • ImportsSystem.IO • NewwebClient • New stream = webClient.OpenRead • NewStreamReader(stream) • While Not isr.EndOfStream • str += isr.ReadLine() • End While

  11. Proxy setting • New NetworkCredential(“username", “pass", “domain") • New WebProxy(“proxyserver", port) • proxy.Credentials = cr • Dim stoper As Boolean = True • proxy.BypassProxyOnLocal= True

  12. Thread • Thread: making the program doing more than one task at the same time . • Some object already have threads • VB does not allow accessing thread form an other thread . We need an other solution • Timer is on of the solution of the problem • If your thread task is done then you cant start the thread again

  13. How to create a thread • Imports Threading ‘ outside the class • Dim myThreadAs Thread • myThread = newThead(addressOfmyInfitTask) • myThread.start()

  14. Example • Make a http request to Google web site . • 1- display full html in a text field • 2- display the head tag only . • 3- make a other button to request SQU web site in the same time . • 4- modify the code in 3 so you use less redundancy .

  15. Serial communication in ES • Atmel AVR microcontrollers

  16. Serial communication • Send bits in serial • Less wiring and asynchronous and synchronous • Baud rate is number of bits per second =(F_CPU/16*baud)-1 • voltage level in microcontroller is different from computer (use Max232).

  17. UBRR : set baud rate UDR : transmit receive data RCX: Data receive complete UDRE:Ready for transition U2X : double the transition baud rate RXEN: Enable Receive Data TXEN: Enable Transmit Data UCPOL: Using the USART as synchronous or a synchronous UCSZ0/1:select the Size Of data(5,6,7,8)bits USBS: number of stop bit UPM0/1:parity (none, odd , even) UMSEL /URSEL : put to Zero.

  18. Serial port object • Imports system.io.ports • Define connection configurations • Using with • Read the buffer using timer • Change the ports form the system • Some GSM modems use virtual serial port • Using AT command to control GSM Modem • You can put some of the configuration during the creation of the object.

  19. Create and configure serial port • ImportsSystem.IO.Ports • Dim serialport As new SerialPort • Withserialport • .PortName= “COM1" • .BaudRate = 9600 • .StopBits = StopBits.One • .DataBits = 8 • .Parity = Parity.None • .Open() • End With

  20. example • Write a program in VB.net that receive a message (number from a web server and display it in a BCD 7 segments in the testing board) use the URL (http://172.22.13.12/embedded)

  21. If you are enemy of Proprietary software • You can use shell script to access your computer hard ware and web servers . • You can user javacomm library to access you computer hard ware and make URL request . • You can follow the new project www.mono-project.com/. • Or any other Opensource languages like python . • You can use a GSM/GPRS modem to direct access the internet with out the need for computer. • Smart phone already have application to handle web events and send notifications

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